Save the following code
javascript:(function(){url='http://pwnyoutube.com/download-video.js';document.body.appendChild(document.createElement('script')).src=url;})();
as a bookmark (or go here and save the “PwnYouTube video” bookmark in your bookmark list or drag it to your bookmark bar). Now, when you are viewing the Youtube video you want to save, click on the bookmark and a bar with download links will appear on top of Youtube:
